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<p class=MsoNormal>Today I poked around looking at specs of SSD’s and
7.2krpm SATA hard disks. I just sampled a bunch of whitepapers on various
drives and averaged the results together. Also, when there wasn’t
an apples-to-apples measurement to compare, I had to calculate, as evidenced by
the IOPS versus avg seek time.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>The comparisons were pretty surprising, to me – <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Sustainable reads: SSD somewhat faster (avg 199MB/s
compared to avg 126 MB/s)<o:p></o:p></p>
<p class=MsoNormal>Sustainable writes: SSD equal to SATA (avg 124MB/s compared
to avg 126 MB/s)<o:p></o:p></p>
<p class=MsoNormal>MTBF: SSD equal to SATA. 1.17 vs 1.20 million
hours<o:p></o:p></p>
<p class=MsoNormal>Read latency: SSD way faster (0.16ms vs 8.5ms)
(which I derived from 6300 IOPS and 8.5ms avg seek time)<o:p></o:p></p>
<p class=MsoNormal>Write latency: SSD somewhat slower (12ms vs
8.5ms) (which I derived from 84 IOPS and 8.5ms avg seek time)<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Actually, I’m not sure how fair the MTBF is.
Because a SATA drive will eventually fail just from being powered on, while the
life of a SSD is basically determined by how much you write to it.<o:p></o:p></p>
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